Multi-screen widgets on screensaver

[David Palacio]

I added support to plasma-overlay for multiple screens. For now only tested on 
a TwinView setup.

I am not sure if the work done on lockprocess.cc will work on non Xinerama 
setups.

To let the plasma app work with multiple views I (ab)use signals/slots.

Related bugs:

Bug 193020: Screensaver widgets can't be moved to second monitor
** (not fixed yet)

Bug 197299: screensaver overlay assumes screen starts at (0,0)  screensaver 
overlay assumes screen starts at (0,0)
** (fixed)
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